Russia strengthens front line defenses against Ukraine.

Russia has constructed extensive fortifications along its 600-mile front line in Ukraine, including trenches, minefields, anti-tank ditches, and "dragon's teeth" barricades. The defenses are focused on key locations and routes, particularly in Crimea, which Ukraine wants back. Military analysts say the defenses won't stop Ukraine's counteroffensive but will likely slow it down. Russia's defenses near Mariupol include circular trenches that could be part of a trap, while defenses near Severodonetsk, Lysychansk, and Popasna pose significant challenges for Ukraine. The UK Ministry of Defence says Russia has moved to a more defensive position in preparation for anticipated Ukrainian offensive operations.